The indication of the directional gyro is valid only for a limited period of time The causes of this inaccuracy are 1 rotation of the earth 2 longitudinal ?
Progression > visibility
Source: Telepilote theorique examen 46
An airborne instrument equipped with a gyro with 2 degrees of freedom and a horizontal spin axis is NB the degree s of freedom of a gyro does not take into account its rotor spin axis ?
An airborne instrument equipped with a gyro with 1 degree of freedom and a horizontal spin axis is a NB the degree s of freedom of a gyro does not take into account its rotor spin axis ?
In a turn at a constant angle of bank turn indicator reading Inversely proportional to aircraft true airspeed. in a turn at a constant angle of bank a decrease in aircraft true airspeed involves an increase in rate of turn rate of turn tas are inversely proportional example rate of turn 3°/sec (rate one turn) tas 100 kt bank angle 15° if now speed becomes 80 kt turn indicator which previously show a 'rate one turn' now showing more than a 'rate one turn'. 
At a low bank angle measurement of rate of turn actually consists in measuring Yaw rate of aircraft. turn indicators turn coordinators actually measure rate of yaw up to rate 1 rate of yaw rate of turn are virtually same. 
The rate of turn the Change of heading rate of aircraft. the rate of turn the number of degrees your heading changes in a period of time usually one second or one minute a standard rate turn typically spoken of in terms of instrument flight performed at 180 degrees of heading change in a one minute period this gives a complete 360° turn in two minutes. 
On ground during a right turn turn indicator indicates Needle to right ball to left. the rate of turn the number of degrees your heading changes in a period of time usually one second or one minute a standard rate turn typically spoken of in terms of instrument flight performed at 180 degrees of heading change in a one minute period this gives a complete 360° turn in two minutes. Question 46-8
On ground during a left turn turn indicator indicates Needle to left ball to right. the rate of turn the number of degrees your heading changes in a period of time usually one second or one minute a standard rate turn typically spoken of in terms of instrument flight performed at 180 degrees of heading change in a one minute period this gives a complete 360° turn in two minutes. Question 46-9
When in flight needle and ball of a needle and ball indicator are on left aircraft Turning left with too much bank. the rate of turn the number of degrees your heading changes in a period of time usually one second or one minute a standard rate turn typically spoken of in terms of instrument flight performed at 180 degrees of heading change in a one minute period this gives a complete 360° turn in two minutes. Question 46-10
When in flight needle and ball of a needle and ball indicator are on right aircraft Turning right with too much bank. the rate of turn the number of degrees your heading changes in a period of time usually one second or one minute a standard rate turn typically spoken of in terms of instrument flight performed at 180 degrees of heading change in a one minute period this gives a complete 360° turn in two minutes. Question 46-11
When in flight needle of a needle and ball indicator on right and ball on left aircraft Turning right with not enough bank. the rate of turn the number of degrees your heading changes in a period of time usually one second or one minute a standard rate turn typically spoken of in terms of instrument flight performed at 180 degrees of heading change in a one minute period this gives a complete 360° turn in two minutes. Question 46-12
When in flight needle of a needle and ball indicator on left and ball on right aircraft Turning left with not enough bank. the rate of turn the number of degrees your heading changes in a period of time usually one second or one minute a standard rate turn typically spoken of in terms of instrument flight performed at 180 degrees of heading change in a one minute period this gives a complete 360° turn in two minutes. Question 46-13
A stand horizon or emergency attitude indicator Contains its own separate gyro. the rate of turn the number of degrees your heading changes in a period of time usually one second or one minute a standard rate turn typically spoken of in terms of instrument flight performed at 180 degrees of heading change in a one minute period this gives a complete 360° turn in two minutes. Question 46-14
In building principle of a gyroscope best efficiency obtained through concentration of mass On periphery with a high rotational speed. the rate of turn the number of degrees your heading changes in a period of time usually one second or one minute a standard rate turn typically spoken of in terms of instrument flight performed at 180 degrees of heading change in a one minute period this gives a complete 360° turn in two minutes. Question 46-15
The diagram representing a left turn with insufficient rudder 1045 On periphery with a high rotational speed. fgabrys i'm pretty sure that correct answer n°3 diagram n°4 represents a left turn with too much rudder in a slipping turn ball will be displaced in direction of turn (in opposite direction a skidding turn) you now have two solutions push on left rudder pedal or decrease bank angle. Question 46-16
The maximum directional gyro error due to earth rotation On periphery with a high rotational speed. apparent drift due to earth's rotation is 15° x sin (latitude) in degrees per hour the latitude in this case the latitude of actual position of aircraft for latitude change (flight north or south) take mean aircraft latitude the period involved. Question 46-17
Heading information given a gyro platform given a gyro at 2 degrees of freedom in horizontal axis. A directional gyro consists of a 2 degrees of freedom horizontal axis gyro it must be aligned corrected the pilot (drift due to earth's rotation transport wander). Question 46-18
Among systematic errors of 'directional gyro' error due to earth rotation make north reference turn in horizontal plane at a mean latitude of 45°n this reference turns 5°/hour to right. earth rate 15°/h at 45°north earth rate 15°/h x sin 45° = 10 6°/h in northern hemisphere gyro drifting at a rate of 15°/h to right (the heading increases). Question 46-19
A turn indicator an instrument which indicates rate of turn rate of turn depends upon 1 bank angle 2 aeroplane speed 3 aeroplane weight the combination regrouping correct statements 5°/hour to right. earth rate 15°/h at 45°north earth rate 15°/h x sin 45° = 10 6°/h in northern hemisphere gyro drifting at a rate of 15°/h to right (the heading increases). Question 46-20
The diagram which shows a 40° left bank and 15° nose down attitude number 1046 5°/hour to right. your aircraft seen from behind. Question 46-21
The heading read on dial of a directional gyro subject to errors one of which due to movement of aircraft this error Is dependent on ground speed of aircraft its true track the latitude of flight. buhoraptor and if it on equator ? the error depends upon position of aircraft on earth the drift error = 0 at equator but this not what question states the question states that apparent drift error depends on ground speed true track the latitude even if it on equator if resulting error zero. Question 46-22
A gravity erector system used to correct errors on An artificial horizon. buhoraptor and if it on equator ? the error depends upon position of aircraft on earth the drift error = 0 at equator but this not what question states the question states that apparent drift error depends on ground speed true track the latitude even if it on equator if resulting error zero. Question 46-23
During a deceleration phase at constant attitude control system of an air driven artificial horizon results in horizon bar indicating a An artificial horizon. errors in the artificial horizon (suction) acceleration errors (linear acceleration) these errors are also known as 'takeoff' errors as they are most noticeable during takeoff two elements cause errors pendulous unit vanes error from the pendulous unit the pendulous unit makes rotor bottom heavy as aircraft accelerates a force from inertia of unit felt at bottom the unit tends to lag behind it tends to swing bottom of gyro towards pilot air driven rotors spin anti clockwise (when viewed from above) so this inertial force will precess through 90° in an anti clockwise direction lifting up right hand side of outer gimbal the skyplate attached to outer gimbal rotates in an anti clockwise direction lifting up right hand side of outer gimbal the skyplate attached to outer gimbal rotates anti clockwise and bank indicates a false right bank error from exhaust vanes during acceleration vanes on right left sides are thrown rearward the result that right hand port more than half open the left side port more than half closed this upsets balanced exhaust of air more air being discharged from right side than from left side the reaction occurs on left side precesses through 90° and lifts up inner gimbal from point nearest pilot to indicate a false climb thus with gyro running anti clockwise a slight indication of right bank climb are obtained during an acceleration. Question 46-24
In a directional gyro gimballing errors are due to An artificial horizon. the term 'gimballing error' used to describe errors which occur when gyro has reached its physical limit in pitch or roll any gimballing errors are due to banked attitudes will disappear after turn complete. Question 46-25
Parallax error An artificial horizon. the ball centered parallax error due to a reading under an oblique angle. Question 46-26
The apparent wander of a directional gyro 15°/h An artificial horizon. 15°/h at poles 0° at equator. Question 46-27
The artificial horizon uses a gyroscope with note degree s of freedom of a gyro does not take into account its rotor spin axis Two degrees of freedom its rotor spin axis continuously maintained to local vertical an automatic erecting system. 15°/h at poles 0° at equator. Question 46-28
The inertia of a gyroscope greater when its rotation speed Higher the mass of spinning wheel located further from axis of rotation. 15°/h at poles 0° at equator. Question 46-29
The rate of turn indicator uses a gyroscope 1 spinning wheel axis of which parallel to yawing axis2 spinning wheel axis of which parallel to pitch axis3 spinning wheel axis of which parallel to roll axis4 with one degree of freedom5 with two degrees of freedomthe combination regrouping all correct statements nb degree s of freedom of a gyro does not take into account its rotor spin axis Higher the mass of spinning wheel located further from axis of rotation. the spin axis of turn indicator gyro aligned along pitch axis (lateral axis) the number of independent ways which a dynamical system can move without violating any constraint imposed on it called degree of freedom the gyro in turn and slip indicator rotates in vertical plane (one degree of freedom only) corresponding to airplane's longitudinal axis a single gimbal limits planes in which gyro can tilt a spring tries to return it to center. Question 46-30
The latitude at which apparent wander of a directional gyro equal to 0 Higher the mass of spinning wheel located further from axis of rotation. 15°/h at poles 0° at equator. Question 46-31
The gyroscope used in an attitude indicator has a spin axis which Higher the mass of spinning wheel located further from axis of rotation. 15°/h at poles 0° at equator. Question 46-32
For an aircraft flying a true track of 360° between 5°s and 5°n parallels precession error of directional gyro due to apparent drift equal to Approximately °/hour. 15°/h at poles 0° at equator. Question 46-33
A rate gyro used in a 1 directional gyro indicator2 turn co ordinator3 artificial horizonthe combination regrouping all correct statements Approximately °/hour. an instrument which measures rate of rotation of an object about an axis a spinning gyroscope precesses or tilts when it rotated in a plane at right angles to its own spin axis the amount gyroscope tilts proportional to rate at which it rotated about an axis at right angles to both its spin axis the axis of its precession (the axis about which it tilts) rate gyros are used in turn slip indicators turn coordinators the spin axis of turn indicator gyro aligned along pitch axis (lateral axis) of aircraft. Question 46-34
A directional gyro consists of a nb degree s of freedom of a gyro does not take into account its rotor spin axis 2 degrees of freedom horizontal axis gyro. an instrument which measures rate of rotation of an object about an axis a spinning gyroscope precesses or tilts when it rotated in a plane at right angles to its own spin axis the amount gyroscope tilts proportional to rate at which it rotated about an axis at right angles to both its spin axis the axis of its precession (the axis about which it tilts) rate gyros are used in turn slip indicators turn coordinators the spin axis of turn indicator gyro aligned along pitch axis (lateral axis) of aircraft. Question 46-35
The spin axis of turn indicator gyro aligned along Lateral axis of aircraft. The spin axis of turn indicator gyro aligned along pitch axis (lateral axis) . Question 46-36
The properties of a gyroscope are 1 rigidity in space 2 rigidity on earth 3 precession 4 schuler oscillations the combination regrouping all correct statements Lateral axis of aircraft. The spin axis of turn indicator gyro aligned along pitch axis (lateral axis) . Question 46-37
The rate of turn given the rate of turn indicator valid For airspeed range defined during calibration of instrument. The spin axis of turn indicator gyro aligned along pitch axis (lateral axis) . Question 46-38
Without any external action axis of a free gyroscope fixed with reference to For airspeed range defined during calibration of instrument. The spin axis of turn indicator gyro aligned along pitch axis (lateral axis) . Question 46-39
Due to rotation of earth apparent drift of a horizontal free gyroscope at a latitude of 45°n ° per hour to right. Earth rate 15°/h at 45°north earth rate 15°/h x sin 45° = 10 6°/h in northern hemisphere gyro drifting at a rate of 15°/h to right (the heading increases). Question 46-40
Due to rotation of earth apparent drift of a horizontal free gyroscope at a latitude of 30°s 7 5° per hour to left. Earth rate 15°/h at 30°south earth rate 15°/h x sin 30° = 7 5°/h in southern hemisphere gyro drifting at a rate of 15°/h to left (the heading decreases).
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